#div_body{
    width: 100%;
    height: 100%;
}
#div_1{
    width: 400px;
    height: 300px;
    float: left;
    margin-left: 21px;
    margin-top: 100px;
}
#div_td1{
     margin-left: 120px;
 }

#div_td1:hover{
   border: 1px solid red;
}